condition mean min max ZT0-3 324.0 324.0 324.0 ZT4-7 233.0 233.0 233.0 ZT8-11 161.65 161.65 161.65 ZT12-15 252.45 252.45 252.45 ZT16-19 249.10000000000002 249.10000000000002 249.10000000000002 ZT20-23 337.20000000000005 337.20000000000005 337.20000000000005